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0.1.0 • Public • Published


Express middleware for resizing images.
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Table of Contents
  1. About The Project
  2. Getting Started
  3. Usage
  4. Roadmap
  5. Contributing
  6. License
  7. Contact

About The Project

  • @knovator/image-resizer is an express middleware that generates images of size and format passed in URL using sharp package.
  • @knovator/image-resizer takes input of public folder path and when it receives a request it checks if the requested image exists in the public folder. If it doesn't, it generates the image in resolution folder and serves it.
  • resolution is passed in the URL as width and height parameters. For example, in /images/1200x850/image.jpg URL 1200 is width and 850 is height. It accepts resolution from 2 digits to 6 digits..
  • Image generation done in following setps:
    • Check if the image exists in the public folder by removing resolution. For example
      • /images/800x800/image.jpg will be checked in /images/image.(jpg|png|webp|jpeg).
    • If the image doesn't exist, it generates the image in specified resolution folder.
  • It also generates images of different format in resolution folder if the image of that format is not exists.
    • For example /images/800x800/image.jpg image request will be generated as /images/800x800/image.jpg by taking /images/image.(jpg|png|webp|jpeg) as input.

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Built With

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Getting Started

@knovator/image-resizer is built as an express middleware, so NodeJS application setup with expressjs is required to start.


  1. Install the package
    npm i @knovator/image-resizer
    # or
    yarn add @knovator/image-resizer

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  • Usage of @knovator/image-resizer is simple. It takes input of public folder path similar to express.static middleware.For example,
    const { resize } = require('@knovator/image-resizer');
    app.use(resize(__dirname + '/public'));
  • @knovator/image-resizer considers jpg, png, webp and jpeg image formats. if you want to use other formats, you can pass it in the extensions parameter. For example,
    const { resize } = require('@knovator/image-resizer');
    app.use(resize(__dirname + '/public', { extensions: ['.png', '.jpg', '.jpeg', '.webp'] }));

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  • [ ] Support for image hosted in s3 bucket.

See the open issues for a full list of proposed features (and known issues).

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Contributions are what make the open source community such an amazing place to learn, inspire, and create. Any contributions you make are greatly appreciated.

If you have a suggestion that would make this better, please fork the repo and create a pull request. You can also simply open an issue with the tag "enhancement". Don't forget to give the project a star! Thanks again!

  1. Fork the Project
  2. Create your Feature Branch (git checkout -b feature/AmazingFeature)
  3. Commit your Changes (git commit -m 'Add some AmazingFeature')
  4. Push to the Branch (git push origin feature/AmazingFeature)
  5. Open a Pull Request

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Distributed under the MIT License. See LICENSE.txt for more information.

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Knovator Technologies




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